Dynamometer.



M. ROCKSTROH.

DYNAMOMETER.

APPLICATION FILED 0Ec.s0. 1915.

1 ,205,93 5 Patented Nov. 21, 1916.

Fig-.1

Fig.2 I 1 fizarzior- %-6fi0cd7707a MAX ROCKSTROH, OF KLEIN-SEDLITZ, NEARPIRNA, GERMANY.

DYNAMOMETER.

Application filed December 30, 1915.

To all who m z'tmay concern Be it known that I, MAX Roons'rnorr,manufacturer, a subject of the King of Saxony, residing atKlein-Sedlitz, near Pirna, Saxony, Germany, have invented certain newand useful Improvements in Dynamometers, of which the following is aspecification.

The present invention relates to dynamometers of the type wherein theenergy to be measured is transmitted to a recording or indicatingmechanism by means of a nonrevolving piston, which is not directlyconnected to the shaft. In one type of such devices the turning momentis transmitted from the driving member or pulley to the driven member byhydraulic means, and it consequently is necessary to employ, formachines of different power consumption, pistons of different sectionalareas, the determination of which sectional areas is very diflicult andthe manufacture of which pistons is very expensive. According to thisinvention the transmission of the turning moment is efi'ected bymechanical means and preferably by the use of only one lever andadjustable abutments. By such an arrangement only a. single size or typeof piston is required, since it is then unnecessary to employ pistons ofdifferent sizes or diameters, the adjustment for the desired turningmoment being effected by means of the adjustable abutments. It isobvious that the piston may also be replaced by a simple rod, disposedwithin a hollow shaft, and such rod may be arranged to directly actuatethe recording or indicating mechanism.

In the accompanying drawing wherein one embodiment of the invention isillustrated Figure 1 is a front elevation of a device of this characterembodying the present invention; Fig. 2 is a longitudinal section, andFig. 3 is a plan, and Fig. 4 is a detail view showing one form ofadjustable abutment.

According to the present invention, the means provided for transmittingthe energy from the driving pulley or member to the driven member orshaft comprises a lever and a cooperatingadjustable abutment interposedbetween the driving and driven members, the adjustments of the abutmentbeing effected in accordance with variations in the force of the turningmoment to be trans- Specification of Letters Patent.

Patented Nov. 21, 1916.

Serial No. 69,424.

mitted between the driving and driven members.

As shown, a lever t is provided which is in the form of a bell cranklever, this lever being pivotally mounted on the shaft or driven membera through the agency of a pivot pin a and the arm a of a collar, thecollar being fixed to the shaft or driven member. The lever t has an arm6 which is movable in substantially a circumferential directionrelatively to the shaft, under the influence of the turning momentapplied thereto, and the lever has an arm t which projects into a recess10 in the shaft or driven member, and this arm 25 of the lever ismovable in substantially the direction of the axis of the shaft underthe influence of the turning moment of the driving member. The shaft ordriven member a is hollow or provided with a bore which extends axiallythereof and preferably concentrically of the shaft, and a rod 2 isfitted to reciprocate longitudinally in this bore in the shaft, one endof the rod 2- being engaged by the arm t of the lever while the oppositeend of the rod projects beyond the end of the shaft and is adapted tobear upon and to operate suitable registering or recording mechanism. Asshown, the outer end of the rod 2 is arranged to actuate the hydraulicpiston Z forming part of a hydraulic registering or recording mechanism.

The driving member in the present instance is in the form of a pulley b,it being provided with an ear 0 which projects laterally therefrom andis formed with a plurality of radially spaced apertures (Z. Theabutment, which is carried by the driving member or pulley and whichcooperates with the arm t of the lever, is shown in the form of a screw7 and this screw or abutment may be placed in any one ofthe radiallyspaced apertures (Z of the driving member.

The mode of operation of the dynamometer constructed as hereinbeforedescribed is, briefly, as follows: Assuming that motion is imparted tothe driving member or pulley b in a clockwise direction in Figs. 1 and4, the abutment f will bear upon the arm t of the lever with a forcewhich is proportionate to the turning moment between the driving anddriven members. The force so applied to the arm t of the lever, by theabutment 7", tends to rotate the lever about the pin to as an axis. Thisforce applied to the lever tends to move the arm 25 of the lever againstthe rod 2 with a force proportionate' to the turning moment between thedriving and driven members. The resulting outward movement of the rod 2,under influence of the arm 52 of the lever, causes this rod to bear uponthe piston Z of the hydraulic measuring or indicating or recordingmechanism with a force proportionate to the turning moment between thedriving and driven members. The measuring mechanism of which the pistonZ is a part will accordingly measure and indicate or record the energytransmitted from the driving to the driven member.

In applying dynamometers of the type hereinbefore referred to tomachines of'di'fferent power consumption, it has been necessary toemploy cylinders and pistons of different sectional areas between thedriving and driven members. This difficulty and expense is avoided bythe present invention, as it is only necessary to "adjust the abutment fin "the appropriate aperture (Z to correspond with the power consumptionof the particular machine to which the dynamome-ter is applied. Thisadjustment enables the same mechanism to be applied to machines thepower consumption of which may be considerably varied.

I claim:

1. In apparatus for measuring the energy transmitted from a drivingmember to a driven member, a lever pivotally mounted 011 one of saidmembers, an abutment carried by the other member and adjustable todifferent radial distances from the axis thereof, saidabutment'cooperating with one arm of said lever, and a part cooperativeCopies of this patent may be obtained for five cents each, byaddressingi the Commissioner of Patent,

Washington, D. C.

with the other arm of said lever for transmitting energy therefrom to ameasurlng device.

2. In apparatus for measuring the energy transmitted from a drivingmember to a shaft, a lever pivotally mounted on the shaft and having oneof its arms movable axially of the shaft and its other arm movable in asubstantially circumferential direction, an

abutment carried by the driving member.

and cooperative with the circumferentially V driving pulley and carryinga radially adjustable abutment, said abutment adapted.

to engage one of the arms of said bell crank lever, the shaft having anaxial bore, a displaceable piston actuating rod mountedin said bore, theshaft also having a radially cut recess at the end of said here, theother arm of said bell crank adapted to project into said recess and actagainst said piston actuating rod.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

. MAX ROCKSTROH. Witnesses:

LEO BERGi-IOLZ, BERT A. BRAUN.

